Since June 1970, NYSE member organizations have been required to report monthly through Form R-1 their aggregate debits in securities margin accounts, as well as aggregate free credits in cash and margin accounts. With revisions in the Federal Reserve Regulation T in June 1983, the general stock margin account, the convertible bond account, the special subscription account and corporate and government bond accounts had to be consolidated into one margin account between June 20, 1983 and June 30, 1984. Thus, beginning in mid-1983, figures for margin debt are not strictly comparable to earlier data.